Table 4. Predicted response values of TY, TAC, TPC, antioxidant activities, energy consumption, and CO₂ emission of eggplant powder extracts using MAE at the optimum condition and efficiency comparison with CRE

Parameter	Extraction method
	MAE1)	CRE2)
TY (%)	1.66	1.70
TAC (mg CE/L)	9.44	8.07
TPC (mg GAE/100 mL)	47.45	50.61
DPPH RSA (mg TE/100 mL)	46.37	43.14
ABTS RSA (mg TE/100 mL)	46.50	65.64
FRAP (mg TE/100 mL)	66.02	44.12
Energy consumption (TOE)3)	0.0000011	0.001380
CO2 emission (TCO2)4)	0.000021	0.002751

¹⁾X₁, ethanol concentration (70%); X₂, microwave power (160 W); X₃, extraction time (100 s).
²⁾X₁, ethanol concentration (70%); X₂, extraction temperature (97.5℃); X₃, extraction time (3 h).
³⁾Energy consumption was calculated in terms of tons of oil equivalent (MAE; 0.16kW × 0.028h × 2,300kcal/10⁷ = 0.0000011 TOE, CRE; 2kW × 3h × 2,300kcal/10⁷ = 0.00138 TOE).
⁴⁾Carbon dioxide emission was calculated in terms of Tones of CO₂ equivalent(MAE; 0.16kW × 0.028h × 0.4585 TOE₂/MWh = 0.0000021 TCO₂, CRE; 2kW × 3h × 0.4585TCO₂/MWh = 0.002751 TCO₂/MWh = 0.002751TOC₂).